CN116093235A - Display device - Google Patents

Display device Download PDF

Info

Publication number
CN116093235A
CN116093235A CN202111271989.6A CN202111271989A CN116093235A CN 116093235 A CN116093235 A CN 116093235A CN 202111271989 A CN202111271989 A CN 202111271989A CN 116093235 A CN116093235 A CN 116093235A
Authority
CN
China
Prior art keywords
light
unit
display device
color conversion
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111271989.6A
Other languages
Chinese (zh)
Inventor
穆琳佳
樊聪聪
杨兰兰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hisense Visual Technology Co Ltd
Original Assignee
Hisense Visual Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hisense Visual Technology Co Ltd filed Critical Hisense Visual Technology Co Ltd
Priority to CN202111271989.6A priority Critical patent/CN116093235A/en
Publication of CN116093235A publication Critical patent/CN116093235A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil

Abstract

The invention discloses a display device, comprising: a display panel and a color conversion substrate positioned on the light emitting side of the display panel; wherein, the color conversion substrate includes: the color conversion unit and the transmission unit are positioned in the opening of the shading layer. The conversion efficiency of the color conversion unit is low, so that the light intensity of blue light is too strong, and white point offset is caused. Therefore, a dielectric layer is arranged between the transmission unit and the substrate, and the refractive index of the dielectric layer is smaller than that of the transmission unit. Therefore, the light rays passing through the transmission unit form the condition of incidence from the light-tight medium to the light-sparse medium, and the large-angle light rays larger than or equal to the total reflection angle are reflected by the medium layer and are absorbed by the shading layer beside the medium layer, so that the aim of properly reducing the emergent intensity of blue light is fulfilled, and the proportion of the three-primary-color light is closer to white balance.

Description

Display device
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
The self-luminous display device has the advantages of no need of arranging a backlight module, simple device structure, lower dark field brightness and the like, and becomes a research focus in the display field.
Currently, self-luminous display devices include organic light emitting diode (Organic Light Emitting Diode, abbreviated as OLED) display devices and light emitting diode (Light Emitting Diode, abbreviated as LED) display devices. The light-emitting units in the OLED display device are OLED devices, and the light-emitting units in the Micro light-emitting diode display device are Micro LEDs (Micro Light Emitting Diode, micro LEDs for short) or Mini LEDs (Mini Light Emitting Diode, mini LEDs for short).
The self-luminous full-color display device can adopt two modes: one is to use three primary colors luminous element to realize full color display; the other is that the single-color light-emitting unit is matched with the color conversion layer to realize full-color display. Because the manufacturing process of the display device adopting the three-primary-color light-emitting unit is complex, the technical difficulty is high, and the cost is high, the full-color display is usually realized in a short period by adopting a mode of matching a color conversion layer.
However, the red and green color conversion efficiency is low, so that the light intensity of blue light is relatively strong, and the white point deviation is serious.
Disclosure of Invention
In some embodiments of the present invention, a display device includes: a display panel and a color conversion substrate positioned on the light emitting side of the display panel; wherein, the color conversion substrate includes: the color conversion unit and the transmission unit are positioned in the opening of the shading layer. The conversion efficiency of the color conversion unit is low, so that the light intensity of blue light is too strong, and white point offset is caused. Therefore, a dielectric layer is arranged between the transmission unit and the substrate, and the refractive index of the dielectric layer is smaller than that of the transmission unit. Therefore, the light rays passing through the transmission unit form the condition of incidence from the light-tight medium to the light-sparse medium, and the large-angle light rays larger than or equal to the total reflection angle are reflected by the medium layer and are absorbed by the shading layer beside the medium layer, so that the aim of properly reducing the emergent intensity of blue light is fulfilled, and the proportion of the three-primary-color light is closer to white balance.
In some embodiments of the present invention, the dielectric layer has a refractive index of 1.1-1.6.
In some embodiments of the present invention, the dielectric layer is made of a silicone (e.g., polydimethylsiloxane) or fluorinated silicone.
In some embodiments of the present invention, light absorbing particles and scattering particles are dispersed in the transmissive unit. The color conversion unit can be made of quantum dot materials or fluorescent materials, and the emergent direction of the stimulated light rays is random, so that scattering particles can be dispersed in the transmission unit in order to keep consistent with the emergent light type of the color conversion unit, and the light rays can be randomly reflected and scattered in all directions after entering the scattering particles. The light absorption particles can absorb part of incident light, so that the emission intensity of blue light is properly reduced, the aim of reducing the emission intensity of blue light can be achieved by matching with the medium layer, and finally, the proportion of three primary colors of light is closer to white balance.
In some embodiments of the invention, the scattering particles may be inorganic oxide particles or metal particles. The light absorbing particles are used for absorbing blue light, so that the light absorbing particles can adopt carbon black particles with strong absorption effect on visible light; alternatively, yellow pigment particles having a strong absorption of blue light may be used. In addition, light-absorbing particles may employ light-converting nanoparticles that convert blue light into invisible light.
In some embodiments of the present invention, the display panel includes a plurality of light emitting units, and the color conversion units and the transmission units are in one-to-one correspondence with the light emitting units; the light-emitting unit is used for emitting blue light; the color conversion unit includes: a red converting unit and a green converting unit.
In some embodiments of the invention, the light emitting unit is a Micro-LED, mini-LED or organic light emitting diode.
In some embodiments of the present invention, the color conversion substrate further includes a filter layer disposed on a side of the base facing the light shielding layer. Since the conversion efficiency of the color conversion unit to blue light is not 100%, a filter layer may be disposed on the light emitting side of the color conversion unit in order to avoid blue light mixed in the light emitted after passing through the color conversion unit.
In some embodiments of the present invention, the filter layer is a yellow filter layer, and the yellow filter layer is provided with an opening at a position corresponding to the transmission unit, and the transmission unit and the medium layer are located in the opening. The yellow filter layer may filter out blue light while passing red and green light. Therefore, the yellow filter layer is arranged in other areas except the position where the transmission unit is, so that the light emitted by the red conversion unit is only red light, and the light emitted by the green conversion unit is only green light. The light emitted by the transmission unit is still blue light without passing through the yellow filter layer, so that the problem of color crosstalk is avoided.
In some embodiments of the present invention, the filter layer includes a red filter unit, a green filter unit, and a blue filter unit. The red filter unit corresponds to the red conversion unit, the green filter unit corresponds to the green conversion unit, and the blue filter unit corresponds to the transmission unit. The dielectric layer is positioned between the blue filter unit and the transmission unit. Therefore, only red light is emitted from the red conversion unit after passing through the red filter unit, only green light is emitted from the green conversion unit after passing through the green filter unit, and blue light is emitted from the transmission unit after passing through the blue filter unit, so that the problem of color crosstalk is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;
FIG. 2a is a schematic diagram of a light propagation path when a dielectric layer is not provided according to an embodiment of the present invention;
FIG. 2b is a schematic diagram of a light propagation path when a dielectric layer is disposed according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a cross-sectional structure of a display device according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a third cross-sectional structure of a display device according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a display device according to an embodiment of the invention.
The light-emitting diode comprises a 100-display panel, a 200-color conversion substrate, an 11-driving substrate, a 12-light-emitting unit, a 21-substrate, a 22-shading layer, a 23-color conversion unit, a 23 r-red conversion unit, a 23 g-green conversion unit, a 24-transmission unit, a 25-medium layer, a 26-filter layer, a 26 r-red filter unit, a 26 g-green filter unit, a 26 b-blue filter unit, a-light-absorbing particles and b-scattering particles.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention. The drawings of the present invention are merely schematic representations of relative positional relationships and are not intended to represent true proportions.
Currently, mainstream display devices can be classified into self-luminous display devices and non-self-luminous display devices, wherein the non-self-luminous display devices are typified by liquid crystal display devices. The liquid crystal molecules do not emit light and need to cooperate with a backlight module to display images. The backlight module is used for emitting light, and the liquid crystal molecules can modulate the transmittance of the light, so that a bright-dark state is formed.
The self-luminous display device directly displays images by using self-luminous devices, and a backlight module is not needed. The self-luminous display device has more and more important positions in the display field due to the advantages of self-luminescence, low power consumption, high contrast, wide viewing angle, high response speed, flexibility and the like. The self-luminous display device is mainly composed of a driving back plate and a self-luminous device, and the self-luminous device which can be applied to the display device at present comprises an organic light-emitting diode and a light-emitting diode.
When light emitting diodes (Light Emitting Diode, abbreviated as LEDs) are used for image display, micro light emitting diodes (Mini-Light Emitting Diode, abbreviated as Mini-LEDs) and Micro-LEDs (Micro-Light Emitting Diode, abbreviated as Micro-LEDs) are commonly used as light emitting devices. The size of the Mini-LED is larger than that of the Micro-LED, and a light-emitting chip with a proper size can be selected for image display according to application scenes.
Because Mini-LEDs and Micro-LEDs have the characteristics of low power consumption, long service life, high stability and self-luminescence without a backlight source, the LED display device has the advantages of energy conservation, high integration and the like, can be applied to almost all main stream display fields, and is considered to be an ideal form of future display technology.
An organic light emitting diode (Organic Light Emitting Diode, abbreviated as OLED) is a light emitting diode device made of an organic material. The OLED device includes an anode, a light-emitting layer, and a cathode. The anode, the light-emitting layer and the cathode form a sandwich structure, after an electric field is generated between the anode and the anode, electrons and holes can move to the light-emitting layer and are combined into excitons in the light-emitting layer, and the excitons excite light-emitting molecules to finally generate visible light.
At present, two main methods for preparing a full-color LED display device are as follows: firstly, a three-primary-color chip is adopted, and the three-primary-color chip is realized through a huge transfer assembly technology. The method needs three chips of red, green and blue, has complex process and high technical difficulty, and especially has low efficiency of the red light chip in the current stage; in addition, the red, green and blue chips have large difference in electrical and optical characteristics, and the driving circuit is difficult to design. And secondly, a blue chip is adopted to realize full-color display by matching with a color conversion layer. The method only needs a blue chip and one-time mass transfer, has lower cost and lower difficulty, and is a better method for realizing full-color display in a short period.
For a full-color OLED display device, a vacuum evaporation red, green and blue device can be adopted, and the method leads to the complicated structure of the OLED display device and low material utilization rate; the process of ink-jet printing red, green and blue devices is not mature, the yield is low, and the blue light ink performance is poor. Therefore, vacuum evaporation blue light OLED devices are matched with color conversion layers to form a full-color OLED display.
According to the experimental data of the current color conversion layer matched with the single-color light emitting device, under the condition of the same light emitting intensity of the light emitting device and consistent area of three-color sub-pixels, the white point offset is serious, the actual measurement coordinates (CIEx, CIEy) are (0.227,0.151), and the theoretical value is (0.30,0.31). The main reason is that the conversion efficiency of the color conversion layer for red and green is low, resulting in a relatively strong blue subpixel intensity, about 3-4 times the desired value.
Then the brightness of the blue sub-pixel needs to be reduced in order to bring the white point color coordinates closer to the rational value. However, if the intensity of the blue sub-pixel is simply adjusted by driving, the adjustable range is limited, and the expected effect is poor. If the intensity is adjusted entirely by changing the subpixel area, the blue subpixel may need to be reduced below the light emitting chip size, greatly increasing the alignment difficulty and process instability.
In view of the above, the embodiment of the invention provides a display device, which can properly reduce the light emitting intensity of the blue sub-pixel, thereby approaching the white balance.
Fig. 1 is a schematic cross-sectional structure of a display device according to an embodiment of the invention.
As shown in fig. 1, the display device includes: a display panel 100 and a color conversion substrate 200.
The display panel 100 is used for displaying images, and in the embodiment of the invention, the emergent light of the display panel 100 is monochromatic light. The display panel 100 includes a driving substrate 11 and a plurality of light emitting units 12 on the driving substrate 11.
The driving back plate 11 is located at the bottom of the display device, and its size is generally adapted to the overall size of the display device, and the size of the driving back plate 11 is slightly smaller than the size of the display device.
In some embodiments, the display device may also include a plurality of driving backplanes 11, where the driving backplanes 11 provide driving signals together by way of stitching. In order to avoid the optical problem caused by splicing the driving back plates 11, the splice between the adjacent driving back plates 11 is made as small as possible, and even seamless splicing is realized.
The shape of the driving back plate 11 is the same as the overall shape of the display device, and may be generally rectangular or square. When the display device is a special-shaped display device, the shape of the driving back plate may be adaptively set to other shapes, which is not limited herein.
The driving back plate 11 is used to supply driving signals to the light emitting units 12. Typically, a circuit board or an array substrate may be employed.
The circuit board may be a printed circuit board (Printed Circuit Board, abbreviated as PCB), and when applied to a flexible display, a flexible circuit board (Flexible Printed Circuit, abbreviated as FPC) may be used, which is not limited herein.
The array substrate can be manufactured by adopting the current mature thin film technology, and the specific structure can be referred to the array substrate of the LCD or OLED display device in the prior art, and the detailed description is omitted here.
The light emitting unit 12 is located above the driving back plate 11 and electrically connected to the driving back plate 11. In the embodiment of the invention, the light-emitting unit is matched with the color conversion substrate to realize full-color display.
In some embodiments, the light emitting unit 12 may employ Micro light emitting diodes, for example, the light emitting unit 12 may employ Mini-LEDs or Micro-LEDs. The sizes of the Mini-LED and the Micro-LED can reach the micrometer or sub-millimeter level, and the size of the Mini-LED is larger than that of the Micro-LED. When the LED light source is applied to different application scenes and the requirements on pixel levels are different, a Mini-LED or a Micro-LED can be used as a light emitting unit according to the implementation conditions.
When the light emitting unit 12 adopts Micro-LEDs, the Micro-LEDs and the driving back plate 11 are usually manufactured separately, and then the Micro-LEDs are transferred onto the driving back plate 11 by a mass transfer technology and bonded with the driving back plate 11.
In some embodiments, the light emitting unit 12 may also employ an OLED. When the light emitting unit 12 is an OLED, the manufacturing method thereof can be referred to in the related art, and will not be described herein. The OLED panel provided by the embodiment of the invention is a monochromatic panel, so that a light-emitting layer does not need to be subjected to fine masking, and the whole surface of the OLED panel can be manufactured, thereby being beneficial to reducing the process difficulty and improving the production efficiency.
The color conversion substrate 200 is located on the light emitting side of the display panel 100, and the size of the color conversion substrate 200 is adapted to the overall size of the display device, and the size of the color conversion substrate 200 is slightly smaller than the size of the display device.
The color conversion substrate 200 has the same shape as the entire shape of the display device, and may be generally rectangular or square, and is not limited thereto.
The color conversion substrate 200 is used to emit light of other colors under excitation of the outgoing light of the display panel 100. The color conversion mode is adopted to form the primary color light for full-color display, so that different color combinations are formed by controlling the brightness of different light emitting units, and full-color display is realized.
As shown in fig. 1, the color conversion substrate 200 includes: a substrate 21, a light shielding layer 22, a color conversion unit 23, and a transmission unit 24.
The substrate 21 is disposed opposite to the display panel 100. The size of the base 21 is adapted to the overall size of the display panel 100, and the size of the base 21 is slightly smaller than the size of the display panel 100.
The shape of the substrate 21 is the same as the overall shape of the display panel 100, and may be generally rectangular or square, which is not limited herein.
The substrate 21 has a supporting and carrying function, and may be made of glass, sapphire or a flexible material in general, which is not limited herein.
The light shielding layer 22 is located at a side of the substrate 21 facing the display panel 100. The light shielding layer 22 includes a plurality of openings for spacing the sub-pixel units. In the embodiment of the present invention, the light emitting units 12 are used as sub-pixel units for displaying images, so that the openings of the light shielding layer 22 can be in one-to-one correspondence with the light emitting units 12, so as to transmit the emergent light of the light emitting units 12, and avoid light crosstalk between the light emitting units 12.
The light shielding layer 22 serves to block light, and thus can be made of a high-absorptivity black gel material. In some embodiments, the light shielding layer 22 may be made of yellow or gray photoresist, so that the light shielding layer 22 can selectively absorb light rays of a specific wavelength band, and enhance the reflection effect on light rays of other wavelength bands, thereby enhancing the light extraction and improving the light utilization rate. For example, if the display panel 100 in the embodiment of the present invention is used for emitting blue light, the yellow or gray photoresist may absorb the blue light and reflect the red light and the green light, so as to increase the emission of the red light and the green light, which is beneficial to improving the problem of white point offset.
A plurality of color conversion units 23 are located in a part of the openings of the light shielding layer 22 for emitting light of other colors under excitation of the emitted light of the display panel. The display device provided by the embodiment of the invention realizes full-color display by adopting a mode of matching a single-color display panel with a color conversion substrate. Wherein the display panel 100 is for emitting blue light, the color conversion unit 23 may include a red conversion unit 23r and a green conversion unit 23g in order to realize three primary color display. The red conversion unit 23r is configured to emit red light upon excitation of blue light, and the green conversion unit 23g is configured to emit green light upon excitation of blue light. The color ratio of the three primary colors is usually adjusted to realize the image display of different colors.
The color conversion unit 23 may be made of a color conversion material, which may be a quantum dot material in which quantum dots are dispersed, and may be stimulated to emit light of different wavelength bands by changing the particle size of the quantum dots. The quantum dot material has the advantages of high color gamut, good color development and the like. In addition, the color conversion material may be formed of a material having color conversion properties, such as a fluorescent material, and is not limited thereto.
A plurality of transmission units 24 are located in a partial opening of the light shielding layer 22 for transmitting outgoing light of the display panel. The display panel 100 is configured to emit blue light as one of the three primary colors of light, and thus the transmission unit 24 may be disposed to directly transmit the blue light to a position where the sub-pixel unit emitting the blue light is located.
The light emitting units 12 in the display panel are in one-to-one correspondence with the openings of the light shielding layer 22, and thus the color conversion units 23 and the transmission units 24 are disposed in the openings of the light shielding layer 22, so that the color conversion units 23 and the transmission units 24 can be in one-to-one correspondence with the light emitting units 12. The opening of the light shielding layer 22 may serve as a barrier wall for fabricating the color conversion unit 23 and the transmission unit 24, and the color conversion unit 23 and the transmission unit 24 may be fabricated by using an inkjet printing method or a photolithography method.
In general, the red converting unit 23r, the green converting unit 23g, and the transmitting unit 24 may be repeatedly arranged in a set order, and adjacent one of the red converting unit 23r, one of the green converting unit 23g, and one of the transmitting unit 24 and its corresponding light emitting unit 12 constitute one pixel unit. The red conversion unit 23r corresponds to a red sub-pixel, the green conversion unit 23g corresponds to a green sub-pixel, and the transmission unit 24 corresponds to a blue sub-pixel.
Since the conversion efficiency of the red conversion unit 23r and the green conversion unit 23g is low, the light intensity of blue light is too strong, thereby causing a white point shift. Therefore, in the embodiment of the present invention, the dielectric layer 25 is disposed between the transmission unit 24 and the substrate 21, and the refractive index of the dielectric layer 25 is smaller than that of the transmission unit 24. Therefore, under the condition that the light rays passing through the transmission unit 24 form incidence from the light-tight medium to the light-sparse medium, the light rays with large angles larger than or equal to the total reflection angle are reflected by the medium layer 25 and are absorbed by the shading layer beside, the aim of properly reducing the emergent intensity of blue light is achieved, and the proportion of the three-primary-color light is closer to white balance.
Fig. 2a is a schematic diagram of a propagation path of light when a dielectric layer is not provided according to an embodiment of the present invention.
As shown in fig. 2a, when the light emitted from the display panel enters the substrate 21 through the transmission unit 24, the light is refracted and emitted due to the different materials used for the transmission unit 24 and the substrate 21, and only some of the large-angle light directly entering the light shielding layer 22 is absorbed by the light shielding layer 22.
Fig. 2b is a schematic diagram of a propagation path of light when a dielectric layer is disposed according to an embodiment of the present invention.
As shown in fig. 2b, after the dielectric layer 25 is disposed between the substrate 21 and the transmissive unit 24, the light emitted from the display panel passes through the transmissive unit 24 and then enters the dielectric layer 25 through the transmissive unit 24, and since the refractive index of the transmissive unit 24 is greater than that of the dielectric layer 25, a total reflection condition is formed, when the incident angle of the light entering the interface between the transmissive unit 24 and the dielectric layer 25 is greater than or equal to the total reflection angle, the light is directly reflected, and the light tends to be a light with a large angle, and therefore, the light after reflection is generally incident on the adjacent light shielding layer 22 and is absorbed by the light shielding layer 22. Whereby more light can be absorbed by the light shielding layer 22 and the light transmitted from the transmission unit 24 can be reduced. When the display panel emits blue light, the light emitted by the transmission unit 24 is blue light, and the emission intensity of the blue light can be properly reduced by providing the medium layer 25, so that the proportion of the three primary colors of light is closer to white balance.
The total reflection angle is related to the difference in refractive index between the transmissive unit 24 and the dielectric layer 25 at both sides of the interface, so that the refractive index thereof can be adjusted by setting the material used for the dielectric layer 25 so that the white point coordinates actually detected finally approach to an ideal value.
Fig. 3 is a schematic cross-sectional view of a display device according to an embodiment of the invention.
As shown in fig. 3, in some embodiments, light absorbing particles a and scattering particles b are also dispersed in the transmissive unit 24. Since the color conversion unit 23 may be made of a quantum dot material or a fluorescent material, the emission direction of the light emitted by the excitation is random, and thus, in order to keep the same with the emission type of the color conversion unit 23, the scattering particles b may be dispersed in the transmission unit 24, and the light may be reflected and scattered randomly in various directions after being incident on the scattering particles b. The light absorbing particles a can absorb part of the incident light, so that the emission intensity of the blue light is properly reduced, and therefore, the light absorbing particles a can cooperate with the medium layer 25 to jointly reduce the emission intensity of the blue light, and finally, the proportion of the tri-primary color light is closer to white balance.
In practice, the scattering particles b may generally be inorganic oxide particles, such as Al 2 O 3 、SiO 2 、ZnO、TiO 2 Or metal particles, etc. may be used, and the present invention is not limited thereto.
The light absorbing particles a are used for absorbing blue light, so that carbon black particles with strong absorption effect on visible light can be adopted by the light absorbing particles a; alternatively, yellow pigment particles having a strong absorption of blue light may be used. In addition to this, light-absorbing particles a may employ light-converting nanoparticles that convert blue light into invisible light. For example, a semiconductor material having a small forbidden band width can be used, for example, an I-III-VI semiconductor (CuInS 2 、CuInSe 2 Etc.), not limited herein.
The transmissive unit 24 also contains corresponding other components, solvents, etc. according to different manufacturing methods. In the case of manufacturing the transmissive unit 24 by the inkjet printing method, it is necessary to manufacture an ink containing a particle material, and it is necessary to add a solvent suitable for printing, such as an aromatic organic substance, or the like. In the case of preparing the transmission unit 24 by photolithography, it is necessary to prepare a photoresist containing a particle material, and an alkali-soluble resin, a polymerizable monomer, an initiator, a solvent, and the like are added, which is not limited herein.
The refractive index of the dielectric layer 25 may be 1.1-1.6 according to the refractive index of the material used for the transmissive unit 24, and specifically, a silicone resin (e.g., polydimethylsiloxane) or fluorinated silicone resin may be used. The thickness of the dielectric layer may be set to 20nm-2 μm.
Fig. 4 is a third schematic cross-sectional view of a display device according to an embodiment of the present invention, and fig. 5 is a fourth schematic cross-sectional view of a display device according to an embodiment of the present invention.
As shown in fig. 4 and 5, the color conversion substrate 200 further includes a filter layer 26 located on a side of the base facing the light shielding layer. Since the conversion efficiency of the color conversion unit to blue light is not 100%, a filter layer 26 may be disposed on the light emitting side of the color conversion unit in order to avoid blue light mixed in the light emitted after passing through the color conversion unit.
In some embodiments, as shown in fig. 4, the filter layer 26 is a yellow filter layer, which is provided with openings at positions corresponding to the transmissive units 24, and the transmissive units 24 and the dielectric layer 25 are both disposed in the openings. The yellow filter layer may filter out blue light while passing red and green light. Therefore, the yellow filter layer is provided in the other area except the position of the transmission unit 24, so that the red conversion unit emits only red light, and the green conversion unit emits only green light. The light emitted by the transmission unit is still blue light without passing through the yellow filter layer, so that the problem of color crosstalk is avoided.
In some embodiments, as shown in fig. 5, the filter layer 26 includes a red filter unit 26r, a green filter unit 26g, and a blue filter unit 26b. The red filter unit 26r corresponds to the red conversion unit 23r, the green filter unit 26g corresponds to the green conversion unit 23g, and the blue filter unit 26b corresponds to the transmission unit 24. For the blue filter unit 26b, the dielectric layer 25 is disposed between the blue filter unit 26b and the transmissive unit 24. Therefore, only red light is emitted from the red conversion unit after passing through the red filter unit, only green light is emitted from the green conversion unit after passing through the green filter unit, and blue light is emitted from the transmission unit after passing through the blue filter unit, so that the problem of color crosstalk is avoided.
In the embodiment of the present invention, the display panel 100 may be a Mini-LED display panel or a Micro-LED display panel, and the structure of the display panel in cooperation with the color conversion substrate 200 for displaying images is shown in fig. 1 to 5. Mini-LEDs or Micro-LEDs are usually manufactured separately from a driving substrate, and then transferred onto the driving substrate for bonding, so that the Mini-LEDs or Micro-LEDs are in a mutually separated matrix structure.
In addition, the display panel 100 may also employ an OLED display panel, and the structure of displaying an image in cooperation with the color conversion substrate 200 is shown in fig. 6. The OLED display panel is usually manufactured by adopting an evaporation method, but the OLED display panel provided by the embodiment of the invention only needs to manufacture a whole blue light-emitting layer, so that the limitation of a fine mask on a process can be avoided.
According to a first inventive concept, a display device includes: a display panel and a color conversion substrate positioned on the light emitting side of the display panel; wherein, the color conversion substrate includes: the color conversion unit and the transmission unit are positioned in the opening of the shading layer. The conversion efficiency of the color conversion unit is low, so that the light intensity of blue light is too strong, and white point offset is caused. Therefore, a dielectric layer is arranged between the transmission unit and the substrate, and the refractive index of the dielectric layer is smaller than that of the transmission unit. Therefore, the light rays passing through the transmission unit form the condition of incidence from the light-tight medium to the light-sparse medium, and the large-angle light rays larger than or equal to the total reflection angle are reflected by the medium layer and are absorbed by the shading layer beside the medium layer, so that the aim of properly reducing the emergent intensity of blue light is fulfilled, and the proportion of the three-primary-color light is closer to white balance.
According to a second inventive concept, the refractive index of the dielectric layer is 1.1-1.6. The dielectric layer is made of silicone resin (such as polydimethylsiloxane) or fluorinated silicone resin. The total reflection angle is related to the refractive index difference between the transmission units and the dielectric layers at the two sides of the interface, so that the refractive index of the transmission units and the dielectric layers can be adjusted by setting materials adopted by the dielectric layers, and the final actually detected white point coordinates approach to ideal values.
According to a third inventive concept, light absorbing particles and scattering particles are dispersed in the transmissive unit. The color conversion unit can be made of quantum dot materials or fluorescent materials, and the emergent direction of the stimulated light rays is random, so that scattering particles can be dispersed in the transmission unit in order to keep consistent with the emergent light type of the color conversion unit, and the light rays can be randomly reflected and scattered in all directions after entering the scattering particles. The light absorption particles can absorb part of incident light, so that the emission intensity of blue light is properly reduced, the aim of reducing the emission intensity of blue light can be achieved by matching with the medium layer, and finally, the proportion of three primary colors of light is closer to white balance.
According to the fourth inventive concept, the scattering particles may be inorganic oxide particles or metal particles. The light absorbing particles are used for absorbing blue light, so that the light absorbing particles can adopt carbon black particles with strong absorption effect on visible light; alternatively, yellow pigment particles having a strong absorption of blue light may be used. In addition, light-absorbing particles may employ light-converting nanoparticles that convert blue light into invisible light.
According to a fifth inventive concept, a display panel includes a plurality of light emitting units, and color conversion units and transmission units are in one-to-one correspondence with the light emitting units; the light-emitting unit is used for emitting blue light; the color conversion unit includes: a red converting unit and a green converting unit. The light-emitting unit is a Micro-LED, a Mini-LED or an organic light-emitting diode.
According to a sixth inventive concept, the color conversion substrate further includes a filter layer positioned on a side of the base facing the light shielding layer. Since the conversion efficiency of the color conversion unit to blue light is not 100%, a filter layer may be disposed on the light emitting side of the color conversion unit in order to avoid blue light mixed in the light emitted after passing through the color conversion unit. The filter layer is a yellow filter layer, and the yellow filter layer is provided with an opening at a position corresponding to the transmission unit, and the transmission unit and the medium layer are positioned in the opening. The yellow filter layer may filter out blue light while passing red and green light. Therefore, the yellow filter layer is arranged in other areas except the position where the transmission unit is, so that the light emitted by the red conversion unit is only red light, and the light emitted by the green conversion unit is only green light. The light emitted by the transmission unit is still blue light without passing through the yellow filter layer, so that the problem of color crosstalk is avoided. Alternatively, the filter layer includes a red filter unit, a green filter unit, and a blue filter unit. The red filter unit corresponds to the red conversion unit, the green filter unit corresponds to the green conversion unit, and the blue filter unit corresponds to the transmission unit. The dielectric layer is positioned between the blue filter unit and the transmission unit. Therefore, only red light is emitted from the red conversion unit after passing through the red filter unit, only green light is emitted from the green conversion unit after passing through the green filter unit, and blue light is emitted from the transmission unit after passing through the blue filter unit, so that the problem of color crosstalk is avoided.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A display device, comprising:
a display panel for emitting monochromatic light;
the color conversion substrate is positioned on the light emitting side of the display panel; the color conversion substrate is used for emitting light of other colors under the excitation of the emitted light of the display panel;
wherein the color conversion substrate includes:
a substrate disposed opposite to the display panel;
a light shielding layer positioned on a side of the substrate facing the display panel; the light shielding layer comprises a plurality of openings;
a plurality of color conversion units located in a part of the openings of the light shielding layer and used for emitting light of other colors under the excitation of the emitted light of the display panel;
a plurality of transmission units located in part of the openings of the shading layer and used for transmitting emergent light of the display panel;
a dielectric layer between the transmissive unit and the substrate; the refractive index of the dielectric layer is smaller than that of the transmission unit.
2. The display device of claim 1, wherein the dielectric layer has a refractive index of 1.1-1.6.
3. The display device of claim 2, wherein the dielectric layer is made of a silicone or fluorinated silicone.
4. A display device according to any one of claims 1 to 3, wherein the display panel includes a plurality of light emitting units, the color conversion units and the transmission units being in one-to-one correspondence with the light emitting units;
the light-emitting unit is used for emitting blue light; the color conversion unit includes: a red conversion unit and a green conversion unit; the red conversion unit and the green conversion unit are made of quantum dot materials.
5. The display device according to claim 4, wherein the transmissive unit has scattering particles and light absorbing particles dispersed therein.
6. The display device of claim 5, wherein the light absorbing particles are one of carbon black particles, yellow pigment particles, or light converting nanoparticles; the light conversion nanoparticles are used for absorbing blue light and converting the blue light into invisible light.
7. The display device according to claim 4, wherein the color conversion substrate further comprises:
and the filter layer is positioned on one side of the substrate facing the shading layer.
8. The display device according to claim 7, wherein the filter layer is a yellow filter layer provided with an opening at a position corresponding to the transmission unit; the dielectric layer and the transmissive unit are located within the opening.
9. The display device according to claim 7, wherein the filter layer includes a red filter unit, a green filter unit, and a blue filter unit; the red light filtering unit corresponds to the red conversion unit, the green light filtering unit corresponds to the green conversion unit, and the blue light filtering unit corresponds to the transmission unit;
the dielectric layer is positioned between the blue filter unit and the transmission unit.
10. The display device of claim 4, wherein the light emitting unit is a Micro-LED, a Mini-LED, or an organic light emitting diode.
CN202111271989.6A 2021-10-29 2021-10-29 Display device Pending CN116093235A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111271989.6A CN116093235A (en) 2021-10-29 2021-10-29 Display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111271989.6A CN116093235A (en) 2021-10-29 2021-10-29 Display device

Publications (1)

Publication Number Publication Date
CN116093235A true CN116093235A (en) 2023-05-09

Family

ID=86201133

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111271989.6A Pending CN116093235A (en) 2021-10-29 2021-10-29 Display device

Country Status (1)

Country Link
CN (1) CN116093235A (en)

Similar Documents

Publication Publication Date Title
EP3339920B1 (en) Photoluminescence device and display panel including the same
CN111509025A (en) Display panel based on quantum dots, preparation method thereof and display device
US20060284532A1 (en) Color display unit
US20150171372A1 (en) Fluorescent material, fluorescent coating material, phosphor substrate, electronic apparatus, and led package
CN108933153A (en) Display panel and preparation method thereof, display device
US11107864B2 (en) Organic light-emitting diode display substrate, method of preparing the same, and display device
CN105204221B (en) Color membrane substrates, display panel and display device
CN109037270B (en) Display panel and display device
CN110858599A (en) Pixel array packaging structure and display panel
CN108538875B (en) Light path control structure, pixel structure, preparation method of pixel structure and display panel
CN112233567A (en) Color conversion assembly, manufacturing method thereof and display panel
WO2012063864A1 (en) Light emitting element and display device
CN112582441B (en) Display panel, display device and preparation method of display panel
CN109426034A (en) Liquid crystal display device
CN110707146B (en) Cover plate, organic light-emitting display panel and display device
US20230102283A1 (en) Display panel and display device
US20200241183A1 (en) Color film structure, color film substrate, display panel and display device
CN114355658A (en) Mixed connection display device and spliced display device
US20230268470A1 (en) Display device
CN116093235A (en) Display device
CN116093236A (en) Display device
CN116093232A (en) Display device and manufacturing method thereof
CN113936567B (en) Display panel and display device
TWI790827B (en) Micro light-emitting diode display device
TWI759241B (en) Pixel structure

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication